diff --git a/Makefile b/Makefile
index 5655479..f45e72b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,37 @@
 HTML2MARKDOWN=html2text
+GIT=git
+GITFLAGS=
+DOXYGEN=doxygen
+DOXYGENFLAGS=
 
-all: bin/tidy README.md
+.PHONEY: api-docs
+all: bin/tidy
 
 bin/tidy:
 	$(MAKE) -C build/gmake
+	$(MAKE) -C build/gmake doc
 
-README.md: README.html
+.FORCE:
+# dummy target to force other targets to always get remade
+
+README.md: README.html .FORCE
 	$(HTML2MARKDOWN) $(HTML2MARKDOWNFLAGS) $< > $@
 
+src/version.h: .FORCE
+	$(GIT) $(GITFLAGS) log --pretty=format:'static const char TY_(release_date)[] = "https://github.com/w3c/tidy-html5/tree/%h";' -n 1 > $@
+
+quickref.html: htmldoc/quickref.html .FORCE
+	cp $< $@
+
+api-docs:
+	$(DOXYGEN) $(DOXYGENFLAGS) htmldoc/doxygen.cfg
+
 install:
 	sudo $(MAKE) install -C build/gmake
 
+version: all src/version.h README.md quickref.html
+
 clean:
 	$(MAKE) clean -C build/gmake
-	$(RM) README.md
+	$(RM) test/testall.log
+	$(RM) -r test/tmp